Abstract: A brake device having a pneumatic brake booster and a master cylinder. The master cylinder operates in response to a combined actuation force derived from a boost force and an input force. The input force is applied to a control rod for opening a valve to develop a pressure differential across a partition. The pressure differential acts on the partition to develop the boost force which is transmitted through a first hydraulic piston retained in the master cylinder. A movable pneumatic piston which carries the control rod is connected to the hydraulic piston and after an initial travel during which the valve is opened acts directly on the hydraulic piston to provide a portion of said actuation force. The input of the pneumatic piston to the hydraulic piston provides a way to operate a master cylinder in response to an input force in the event of a failure of a hydraulic circuit connected to the master cylinder.

Abstract: A pneumatic booster having a casing (16) formed from a cylinder (32) and a cover (34). The casing (16) is divided into two chambers (18,20) by a movable wall (10). The movable wall. (20) has a plate (12) and a flexible membrane (14). A bead (30) on the outer peripheral edge of flexible membrane (14) is fixed to the casing (16). The flexible membrane (14) forms a fold in a space located between the peripheral edge of the plate (12) and the casing (16). The plate (12) is secured to a hub structure which houses a valve member for operating the pneumatic booster. The plate (12) which is substantially parallel to the end cover has an extension (40) that extends in a forward direction substantially concentric to the cylinder (32). The extension (40) has front part (46) and a rear part (44) with a radial shoulder (42) on the front part.

Abstract: A pressure-holding valve for a brake system having a body with a blind bore therein. The body has a first passage which connects the blind bore with a variable pressure inlet port and a pressure outlet port. The blind bore is closed by seals carried on a plug having an axial passage therein connecting said inlet port with a second passage connected to the first passage. A non-return valve is located in said blind bore between the plug and the bottom of the blind bore while a valve controlled by an electromagnet is locate in the plug. In response to an operational signal the valve controlled by the electromagnet is moved into engagement with a seat to interrupt communication between the inlet port and the first passage.

Abstract: A drum brake having a support plate (10) with first and second shoes (12,14) slidably mounted thereon. Each of the shoes (12,14) having a web (12a,14a) and a rim (12b,14b) with a face for receiving a friction lining (16,18). Each web (12a,14a) has a first end and a second end. The rim holds the friction lining in a position to engage a drum (20) in response to an input force applied to the first end of the webs (12a,14a) of the shoes (12,14) by a hydraulic actuation device (22). A bearing member (28) is secured to the support plate (10) and is connected to a second end of the webs (12a,14a). A spacer device (40) arranged in the vicinity of the hydraulic device has a variable length to establish a spacing between the shoes (12,14) and drum (20). A mechanical actuation device (50) secured to a web (14a) of shoe (14) has a first actuation lever (60) and a second lever (70).

Abstract: A sliding caliper disk brake having first and second pads with a body having first and second lateral ends. One of the first and second lateral ends tractionally engages by a yoke while the other lateral end bears against the yoke. The first and second lateral ends have a rounded profile to optimize the transmission of drive loads into the yoke during a braking application such the braking forces are balanced between the first and second lateral ends.

Abstract: The invention relates to a pedal for a motor vehicle, particularly a brake pedal.The pedal rod (50) is articulated on a pin borne by a yoke securely attached to the end of the control rod (56). According to one embodiment, the yoke and the pedal rod are held against the pin by a resilient system constituted by a spring-forming wire (100) which interacts with the surface (54) of the pedal rod and the ends of which are securely attached to the yoke.

Abstract: This three-way pneumatic solenoid valve comprises: a first inlet (1) connected to a first pressure source (A); a second inlet (2) connected to a second pressure source (D); an outlet (3) connected to a chamber at controlled pressure (C); a hollow body (4) into which t here emerges each of the paths so as to be set in communication therein in a selective fashion with at least one other path; and an electromagnet (5) secured to the body and including a core plunger (5a) capable of actuating means suitable for establishing the selective communication.The latter essentially comprise a stationary valve (6) and a movable valve (7) housed in the hollow body, the stationary valve being capable of being open when the movable valve is closed and vice-versa, and these valves being defined by a shaft (60), a tubular and movable stopper member (67), and a sealed surface (70) actuated by the electromagnet.

Abstract: A disk brake having a yoke having a caliper mounted on a carrier by a guide pin. A spring having a filiform structure with a first end connected to an arch of the caliper and a second end connected to the yoke. The first end of the spring engages the yoke such that as the caliper slides with respect to the yoke during actuation of the brake, the end acts on the caliper to return the caliper to a rest position on termination of the actuation of the brake.

Abstract: A vehicle comprises an engine compartment and a passenger space which are separated by an apron (76), and a pneumatic brake booster comprises a casing (10) formed of a front shell (10a) and a back shell (10b) inside which is located a piston (20) including a back tubular part (22) and supporting a skirt (14) which, with the aid of an unrolling membrane (12), defines a first chamber (16), or front chamber, connected permanently to a source of partial vacuum and a second chamber (18), or back chamber, connected selectively to the front chamber (16) or to atmosphere by a valve mechanism (40) actuated by a control rod (34), the casing (10) of the booster comprising a mechanism (74) for securing the booster to the apron (76) of the vehicle.

Abstract: A hydraulic brake circuit is intended for a motor vehicle provided at least with an electrically pilot-controlled braking function, and including at least a master cylinder (1), an electric pump (2), first and second brake motors (3, 4), first and second respective solenoid valves (5, 6), and a low-pressure capacity (7). In addition to a conventional accumulation chamber (8), the capacity (7) comprises an access chamber (13) which interacts with the accumulation chamber (8) to form a simplified distributor which offers additional switching options which can be used for a new braking function.

Abstract: A thermal protection device includes a screen (1) and a support (2), the screen (1) for intercepting the radiation (3) from an intense heat source. The screen (1) is applied to the support (2) by elastic deformation and held thereon by exerting on a first bearing surface (4a) and on a second bearing surface (4b) forces oriented respectively along opposite directions.

Abstract: This brake-booster device comprises a pneumatic brake-booster (1) associated with a master cylinder (2). The booster comprises a movable pneumatic piston (5) bearing a valve (7) and functions according to a hydraulic reaction principle, the hydraulic piston (11) of the master cylinder comprising in fact a hollow movable cylinder (13) receiving a boost force, and a secondary hydraulic piston receiving an input force, these two forces constituting the total actuation force. A helical spring (22), exerting an adjustable resilient force, is disposed between the secondary hydraulic piston and the movable cylinder so as to permit the adjustment of the non-zero minimal value of the actuation force.

Abstract: This boosted brake device comprises a pneumatic brake booster (1) associated with a master cylinder (2), the booster operating according to a hydraulic reaction principle and comprising a movable pneumatic piston (5) carrying a control valve (7) actuated by a rod (8), as well as a partition (4) which can move under the effect of a pressure difference and which develops a boost force.The movable wall (4) is mounted slidingly with respect to the pneumatic piston (5) in order to act early on the master cylinder.The device of the invention allows greater braking for small values of the travel of the control rod.

Abstract: The invention relates to a removable thrust rod in a brake-booster of the partial vacuum type. The thrust rod (24) is attached securely to a skirt-shaped component (42) which surrounds the reaction disk (30) and to a component (44). A detachable component (50) comprises clipping fingers (54) which interact with the periphery of the component (44) and an annular part (52) which is flattened onto the piston (18) of the booster by a return spring (34).

Abstract: The invention covers a brake-booster of the partial vacuum type comprising a direct braking control mechanism (hill-holder or traction control). In order to implement these functions, the piston (20, 22) of the booster is "double" through a partition (52) which is attached securely to the piston and defines with the piston a third chamber (50). This chamber is connected by a flexible pipe (66) and a double valve (72) either to partial vacuum (78) or to atmospheric pressure (76).

Abstract: The invention relates to a rigid mounting for a brake unit with pneumatic booster (2) the walls of which can be lightened. The booster comprises an internal reinforcement (9) in the shape of a hat with a rim, the bottom (9a) of which is attached to the master cylinder (1) and the rim (9b) of which applies the booster against the perimeter of an aperture (5a) of the apron (5) of the vehicle.

Abstract: The compensator comprises, in known manner, a body (1) in which are defined two pressure chambers (2, 3), a piston (4) carrying a valve (6) capable of bringing the chambers into communication with one another, a bearing mechanism (8, 81) and a reaction mechanism. The reaction mechanism comprises a second piston (5) sliding inside the first, a deformable member (8), and a locking mechanism (10, 11), in such a manner that the output pressure (P1) as a function of the input pressure (Po) has more than two slopes.

Abstract: The invention relates to a motor vehicle pneumatic brake booster, comprising a casing (10) inside which a piston (20) formed from a rear tubular part (22) supporting a skirt (14) defines, with the aid of an unrolling membrane (12), a front chamber (16), permanently connected to a vacuum source and a back chamber (18) alternately connected to the front chamber (16) or to the atmosphere via a valve (40) actuated by a control rod (34) capable of bearing, by a plunger (32), on one of the faces of a reaction disk (58) securely fastened to a thrust rod (56), the valve comprising a valve element interacting via an active part (40) with a first valve seat (32a) formed on the plunger (32) and a second valve seat (20a) formed on the piston (20), the valve element (40) normally being stressed forward by an elastic element (44).

Abstract: The invention relates to a pressure regulation device for a hydraulic system comprising at least one generator (30) of fluid under pressure, a brake actuator (28) and a reservoir (32) of fluid under low pressure, and including an electrovalve controlled by a computer, the electrovalve being connected via a duct (29) to the generator (30) of fluid under pressure and via a duct (31) to the brake actuator (28), and comprising in a casing (8) an electrical coil (10) and a sliding magnetic core (12) controlling a slide valve (16) sliding in a bore provided in a body (18), the slide valve (16) determining two chambers (22, 40) arranged on either side of the slide valve (16) and being formed with a valve (48) with ball (50) co-operating with a seating (52) formed on the casing (8), the slide valve (16) being formed with a groove (34) delimited by two bearing surfaces (36, 38).

Abstract: The invention relates to a pressure regulation device for a hydraulic system comprising at least one generator (30) of fluid under pressure, a hydraulic actuator (28) and a reservoir (32) of fluid under low pressure, and including an electrovalve controlled by a computer and comprising in a casing (9) an electrical coil (10) and a sliding magnetic core (12) controlling a slide valve (16) sliding in a bore provided in a body (18), the slide valve (16) determining two chambers (22, 36) arranged on either side of the slide valve (16) in the bore, the slide valve comprising a hydraulic chamber (40) communicating with the hydraulic actuator (28) and determining a reaction force adding itself to the force produced by the coil (10), against a prestressed resilient means (20). The hydraulic chamber (40) is delimited by a bore (41) made in the slide valve (16), an end part (43a) of a sleeve (43), a rod (42) and a cup (60) for leaktightness between the rod (42) and the bore (41) of the slide valve (16).